概述：1) The engine temperature is too high
(1) The engine temperature is too high
If the engine temperature is too high, it will not only accelerate the aging and deterioration of the oil, but also easily make the oil thinner, resulting in the decrease of oil pressure.
(2) Lack of oil
If the oil quantity is insufficient, the oil quantity in the oil pump will be reduced, resulting in the decrease of oil pressure and aggravating the wear of crankshaft and bearing, cylinder liner and piston.
(3) The oil pump stops running or the oil pump is short of oil
If the driving gear of the oil pump is cracked or the matching key is disconnected from the fixed pin of the transmission shaft, and the oil absorbing substance of the oil pump is stuck with the oil pump gear, the oil pump will stop working and the oil pressure will drop to 0.
(4) The fit clearance between crankshaft and connecting rod bearing is too large
After long-term use of the engine, the clearance between crankshaft and connecting rod bearing will gradually increase, and the oil pressure will also decrease.
(5) Oil filter blocked
When the oil is blocked by the filter and cannot flow, the safety valve at the bottom of the filter is lifted, and the oil directly enters the main oil channel without filtering. If the opening pressure of the safety valve is too high, when the filter is blocked, the safety valve can not be opened in time, so the pressure of the oil pump increases, adding internal leakage, and the oil supply is in the main oil channel, resulting in the decrease of oil pressure.
The above is the reason why the oil pressure of mixer truck is too low. I hope it can help you.